/ Dictionary / Index P Perbunan: Meaning and Definition of Find definitions for: Per•bu•nan Pronunciation: (pûr-by'nun), [key] — Trademark. Trademark. a brand of synthetic rubber made by copolymerizing acrylonitrile with butadiene. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. perboric acid perc Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language